72
4.2 Max/Min
Acuvim II series meter logs maximum and minimum value statistics for phase/
line voltages, current, power, reactive power, apparent power, power factor,
frequency, demand, unbalance factor, THD as well as the time they occur. All
data is stored in non-volatile memory so that statistic information can be
preserved even when meter is shut o. All maximum and minimum data can be
accessed via communication or from the meter front but time stamps can only
be accessed via communication. Statistics can be cleared via communication or
from the meter front.
4.3 Harmonics and Power Quality Analysis
1. Harmonics
Acuvim II series meter can measure and analyze THD, harmonics support 2
nd
to
63
rd
, even HD, odd HD, crest factor, THFF, K factor etc. They are shown in Fig 4-2.
Note:
When selecting 400Hz type,only support 2
nd
~15
th
harmonics;
2. Phase angle
Phase angle indicates the angle between phase A voltage and other voltage/
current parameters. Angle ranges from 0 to 360 degrees. This function is to help
users nd out the relationship between all input signals avoiding wrong wiring.
When it is set to “2LL” or “3LL”, it gives out the phase angles of u23, u31, i1, i2,i3
corresponding to u12. When it is set to “3LN”, it gives out the phase angles of u2,
u3, i1, i2 and i3 corresponding to u1. When it is set to “1LL”, it gives out the phase
angles of u2, i1, i2 corresponding to u1. They are shown in Fig 4-4.
3. Sequence component and unbalance analysis
Acuvim II series meter is able to perform sequential analysis for the input signal.
It looks at the positive sequence, negative sequence and zero sequence of
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